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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: tìm các stn a,b biết: a.b=6936 ; bcnn a,b =204

Toán Lớp 6: tìm các stn a,b biết: a.b=6936 ; bcnn a,b =204

Comments ( 1 )

  1. \text{Ta có: a . b = [a; b] . (a; b)}
    \text{Thay vào, ta có: 6936 = 204 . (a; b)}
    \text{→ (a; b) = 6936 : 204}
    \text{→ (a; b) = 34}
    \text{Do (a; b) = 34 nên ta có a = 34n và b = 34m với (n; m) = 1.}
    \text{a . b = 6936}
    \text{→ 34n . 34m = 6936}
    \text{34² . (n . m) = 6936}
    \text{1156 . (n . m) = 6936}
    \text{n . m = 6936 : 1156}
    \text{n . m = 6}
    \text{Mà 6 = 1 . 6 = 2 . 3}
    \text{→ (n; m) = (1; 6); (6; 1); (2; 3); (3; 2).}
    \text{→ (a; b) = (34; 204); (204; 34); (68; 102); (102; 68).}

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222-9+11+12:2*14+14 = ? ( )